In the article by Ioana Borze, Satu Mustjoki, Eeva Juvonen, Sakari Knuutila entitled “Oligoarray comparative genomic hybridization in polycythemia vera and essential thrombocythemia”, published on Haematologica 2008; 93:1098–1100, an author’s name was misspelled: the second author should be read as Satu Mustjoki and not Satu Mustjokio.